Browsing by Author "Meena, S.S."

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    A study on magnetorheological and sedimentation properties of soft magnetic Fe58Ni42 particles
    (Elsevier B.V., 2022) Aruna, M.N.; Rahman, M.R.; Joladarashi, S.; Kumara, H.; Meena, S.S.; Sarkar, D.; Umesh, C.K.
    In this study, the samples with two volume fractions (ϕ) of Fe58Ni42 (permalloy) i.e. (ϕ1 = 25 and ϕ2 = 30 %) were used as magnetic particles, silicone oil as a carrier fluid, and aluminium disterate as an additive. As received Fe58Ni42 particles surface morphology and composition of the Fe58Ni42 were investigated using field emission scanning electron microscopy (FESEM) coupled with energy dispersive spectroscopy (EDS), respectively. The X-ray Diffraction (XRD) structural information analysis confirmed Fe58Ni42 particles have a face-centered cubic phase, corresponding with the result of the high resolution transmission electron microscopy (HRTEM) characterization technique. The magnetorheological properties were tested via rotational rheometer at four different magnetic field strengths. The results show that sample PMRF-30 has a maximum shear stress, shear viscosity, and dynamic modulus greater than the PMRF-25 sample. In addition, experimental shear stress flow curves are well fitted with Herschel-Bulkley rather than Bingham and Casson rheological models. The permalloy based magnetorheological fluid (PMRF) samples were prepared with a 25 % volume fraction and a 30 % volume fraction of permalloy particles with a sample abbreviation of PMRF-25 and PMRF-30, respectively. Furthermore, the sedimentation stability of suspensions of both the samples was observed using visual inspection. This method result shows the sedimentation ratio with respect to time of 72 h was 31 % and 29 %, respectively. © 2022 Elsevier B.V.
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    Mineralogical studies of low grade iron ore from Bellary-Hospet region, India
    (2019) Mohanraj, G.T.; Krishneindu, P.; Choudhary, R.P.; Meena, S.S.; Yusuf, S.M.; Rahman, M.R.
    Detailed mineralogical characterization study has been conducted on low grade iron ore sample from Bellary-Hospet region, Karnataka, India by using XRD, optical microscopy and M�ssbauer spectroscopy techniques for identifying the eminence of iron ore sample. Liberation analysis was carried out by particle size analysis and specific gravity measurement. Chemical analysis results showed that, -125+90? size fraction assaying up to 57.34% Fe, 8.55% SiO 2 and 8.6% Al 2 O 3 . XRD analysis revealed the presence of major hematite phase along with kaolinite, gibbsite, quartz and goethite in the sample. Microscopic study confirms the transformation of magnetite to hematite by martitization. M�ssbauer spectrum reveals the existence of hematite ?-Fe 2 O 3 phase with small distortion in crystal structure. � 2019 Author(s).
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    Mineralogical studies of low grade iron ore from Bellary-Hospet region, India
    (American Institute of Physics Inc. subs@aip.org, 2019) Mohanraj, G.T.; Krishneindu, P.; Choudhary, R.P.; Meena, S.S.; Yusuf, S.M.; Rahman, M.R.
    Detailed mineralogical characterization study has been conducted on low grade iron ore sample from Bellary-Hospet region, Karnataka, India by using XRD, optical microscopy and Mössbauer spectroscopy techniques for identifying the eminence of iron ore sample. Liberation analysis was carried out by particle size analysis and specific gravity measurement. Chemical analysis results showed that, -125+90μ size fraction assaying up to 57.34% Fe, 8.55% SiO 2 and 8.6% Al 2 O 3 . XRD analysis revealed the presence of major hematite phase along with kaolinite, gibbsite, quartz and goethite in the sample. Microscopic study confirms the transformation of magnetite to hematite by martitization. Mössbauer spectrum reveals the existence of hematite α-Fe 2 O 3 phase with small distortion in crystal structure. © 2019 Author(s).